CALIFORNIA UTILITIES' REGULATORY MATTERS - SCHEDULE OF REGULATORY AMOUNTS 1 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
San Diego Gas and Electric Company and Subsidiary [Member]
Schedule of Cost of Capital [Line Items]
Authorized Return On Rate Base Previous	8.40%
Authorized Return On Rate Base	7.79%
General Rate Case [Line Items]
General Rate Case, Annual Revenue Requirement Increase Request	$ 235
General Rate Case, Percentage Annual Revenue Requirement Increase Request	14.60%
General Rate Case, Revenue Requirement Request	1,849
General Rate Case Revenue Requirement Recommended	1,749
General Rate Case, Annual Revenue Requirement Increase Recommended	135
General Rate Case, Percentage Annual Revenue Requirement Increase Recommended	8.40%
Recommended Revenue Requirement Understatement	3
Regulatory Recovery, Deductible Per Event	5
Incremental Insurance Premiums Cost Recovery In GRC	67
Southern California Gas Company [Member]
Schedule of Cost of Capital [Line Items]
Authorized Return On Rate Base Previous	8.68%
Authorized Return On Rate Base	8.02%
General Rate Case [Line Items]
General Rate Case, Annual Revenue Requirement Increase Request	268
General Rate Case, Percentage Annual Revenue Requirement Increase Request	14.50%
General Rate Case, Revenue Requirement Request	2,112
General Rate Case Revenue Requirement Recommended	1,952
General Rate Case, Annual Revenue Requirement Increase Recommended	108
General Rate Case, Percentage Annual Revenue Requirement Increase Recommended	5.90%
Recommended Revenue Requirement Understatement	$ 52